Added a filesize check for existing_db.sql in updater to stop update process if the expoerted database dump is smaller then about 60 KB.

Author: tbrehm

install/update.php

@@ -149,6 +149,8 @@
 	system("mysqldump -h '".$conf['mysql']['host']."' -u '".$conf['mysql']['admin_user']."' -c -t --add-drop-table --create-options --quick --result-file=existing_db.sql ".$conf['mysql']['database']);
 }
 
+if(filesize('existing_db.sql') < 60000) die('Possible problem with dumping the database. We will stop here. Please check the file existing_db.sql');
+
 // create a backup copy of the ispconfig database in the root folder
 $backup_db_name = '/root/ispconfig_db_backup_'.@date('Y-m-d_h-i').'.sql';
 copy('existing_db.sql',$backup_db_name);